US6202644B1 - Diving snorkel - Google Patents

Abstract

A diving snorkel provided in the proximity of at least one of an upper opening and a mouthpiece with at least one partition extending from an inner wall of a snorkel conduit and also extending longitudinally of the conduit so as to compartmentalize the conduit in its circumferential direction, and thereby enable undesirable inflow of water to be obstructed as effectively as possible and enable efficient purging of water which enters into the snorkel.

Description

BACKGROUND OF THE INVENTION

This invention relates to diving snorkels such as used by divers or swimmers.

Conventional snorkels comprise a snorkel conduit provided with an upper opening lying above the water surface during actual use of the snorkel, a mouthpiece lying under the water surface during actual use of the snorkel, and a lower opening including a non-return valve adapted to be opened downwards and lying under the water surface during actual use of the snorkel.

The known snorkel, for example, from Japanese Utility Model Registration Gazette No. 2536368 usually has its upper opening defined by a first tubular portion and a second tubular portion extending in parallel to each other. These first and second tubular portions are laterally communicate with each other via a passage. Between the first tubular portion and the second tubular portion, the conduit is substantially in a curved condition so that undesirable inflow of water into the mouthpiece through the upper opening can be obstructed as reliably as possible.

A quantity of water having flowed into the snorkel through the upper opening lying above the water surface during actual use of the snorkel must be forced out by a swimmer's expiration. Consequently, a larger quantity of water inflow will correspondingly increase a swimmer's physical fatigue. To alleviate such physical fatigue, it is required for the snorkel of well known art to obstruct the inflow of water through the upper opening as effectively as possible. While the snorkel of well known art intends to achieve this by curving the conduit, its inflow obstructing ability is not satisfactory.

Commonly to the conventional snorkels inclusive of the above-mentioned snorkel of prior art, a quantity of water staying immediately below the mouthpiece often generates turbulence as a swimmer attempts to purge out a quantity of water remaining within the snorkel by vigorous expiration. Such phenomenon may prevent the quantity of water from rapidly moving toward the upper opening. The expiration for purge thus utilized in vain will further increase the swimmer's physical fatigue.

SUMMARY OF THE INVENTION

In view of the problem as has been described above, it is an object of the invention to alleviate a swimmer's physical fatigue inevitably caused by the conventional snorkel and to eliminate the cause of such physical fatigue.

According to the present invention, there is provided a diving snorkel comprising a snorkel conduit provided with an upper opening, a lower opening a mouthpiece, and a non-return valve adapted to be opened downwards, wherein the snorkel conduit is provided in the proximity of at least one of the upper opening and the mouthpiece with at least one partition extending inwardly from an inner wall of the conduit and also extending longitudinally of the conduit so that the conduit is circumferentially comparmented by the partition.

According to one embodiment of present invention, the partition formed in the proximity of the mouthpiece lies in a region of the inner wall of the conduit opposed to a breathing seat of the mouthpiece.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a snorkel according to a principle of the invention;

FIG. 2 is a perspective view showing an upper portion of the snorkel as partially broken away;

FIG. 3 is a side view showing the snorkel in the proximity of a mouthpiece as partially broken away;

FIG. 4 is a sectional view taken along a line IV—IV in FIG. 3;

FIG. 5 is a view similar to FIG. 1, showing an alternative embodiment of the invention;

FIG. 6 is a side view showing an upper portion of the snorkel shown in FIG. 5 as partially broken away;

FIG. 7 is a perspective view showing the upper portion of the snorkel shown in FIG. 5 as partially broken away; and

FIG. 8 is a sectional view taken along a line VIII—VIII in FIG. 1, showing various embodiments (A)˜(D).

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Details of a snorkel according to the invention will be more fully understood from the description given hereunder with reference to the accompanying drawings.

FIG. 1 is a side view showing a snorkel1 and a position of water surface W during actual use of the snorkel1. The snorkel1 comprises asnorkel conduit2 extending vertically of the figure and thissnorkel conduit2 has anupper opening3 and alower opening4 provided, in turn, with a non-return valve6 which will be described later in more detail. In the proximity of thelower opening4, abranch conduit7 extends upward from theconduit2 and an upper end of thisbranch conduit7 forms a mouthpiece9 provided with a pair of bit-projections8.

The snorkel1 allows a swimmer to breathe through the mouthpiece9 held in his or her mouth by means of the bit-projections8 so that a quantity of air aspirated by the swimmer may be taken in through theupper opening3 lying above the water surface W and a quantity of air expired by the swimmer may be forced out also through theupper opening3. A quantity of water having flowed into the snorkel1 can be forced out through theupper opening3 by instantaneous vigorous expiration of the swimmer. When the swimmer who has made a deep dive thereafter rises again toward the water surface W until the snorkel1 restores its position as shown in FIG. 1, a quantity of water contained in the snorkel1 which is now partially exposed above the water surface W has a pressure sufficient to open the non-return valve6 and the quantity of water is purged out through thedrainage opening4. A quantity of water remaining within the snorkel1 is then forced out by the swimmer's expiration.

FIG. 2 is a perspective view of theconduit2 in the proximity of theupper opening3 as partially broken away. Within theconduit2, there is providedpartitions11 extending inwardly from the inner wall radially or parallel to one another and extending from theopening3 longitudinally of theconduit2 so that thepartitions11 may circumferentially compartmentalize an inner space of theconduit2. When a plurality ofsuch partitions11 are provided as shown, they may be formed so as to extend in parallel one to another longitudinally of theconduit2. Thepartitions11 serve as baffle plates adapted to obstruct undesirable inflow of water, on one hand, and to rectify a stream of water forced out by expiration or a stream of fresh air taken in by aspiration of the swimmer both through theupper opening3, on the other hand. Breathing of the swimmer is thereby facilitated.

FIG. 3 is a side view of the snorkel1 in the proximity of the mouthpiece9 as partially broke away and FIG. 4 is a sectional view taken along a line IV—IV in FIG.3. The mouthpiece9 includes abreathing seat13 directly communicating with thebranch conduit7 and the inner wall of theconduit2 facing thebreathing seat13 is formed withsecond partitions12. Thepartitions12 extend inwardly from the inner wall radially or parallel to one another and also longitudinally of theconduit2 so that they may circumferentially compartmentalize theconduit2. While there may be provided at least onesecond partition12, if it is desired to provide a plurality of suchsecond partitions12, as shown, they may be arranged so as to extend in parallel one to another longitudinally of theconduit2. With the snorkel1 having suchsecond partitions12, the swimmer's vigorous expiration can efficiently force out a quantity of water contained within theconduit2. This is for the reason that a quantity of water remaining immediately below thebreathing seat13 can be rectified along thesecond partitions12 without generation of any turbulence and rapidly moved toward theupper opening3. In this manner, the swimmer's expiration can be efficiently utilized to purge out the quantity of water and the swimmer's fatigue can be correspondingly alleviated.

Thelower opening4 at the bottom of theconduit2 is provided with a non-return valve6 mounted thereon from outside of theconduit2. The nonreturn valve6 is made of a soft elastic material and adapted to be opened downwards.

FIG. 5 is a side view showing asnorkel51 according to an alternative embodiment of the invention, FIG. 6 is a side view of thissnorkel51 in the proximity of theupper opening3, viewed as partially broken away, and FIG. 7 is a perspective view corresponding to FIG. 6 as partially broken away. Except for the portion in the proximity of theupper opening3, thesnorkel51 is similar to the snorkel1 shown in FIG.1. The arrangement of thesnorkel51 in the proximity of theupper opening3 is substantially the same as the arrangement disclosed in the previously mentioned Japanese Utility Model Registration Gazette No. 2536368. Specifically, the top of theconduit2 is actually defined by a firsttubular portion53 and a secondtubular portion54 extending in parallel to the firsttubular portion53, thesetubular portions53,54 laterally communicate with each other via apassage56. Theupper opening3 comprises twoopenings3A,3B formed at upper and lower ends of the secondtubular portions54, respectively, so that draft/purge can occur through both of these twoopenings3A,3B. The inner wall of the secondtubular portion54 is provided with a plurality offirst partitions11 extending inwardly from a region of the inner wall opposed to thepassage56 radially or parallel to one another and also longitudinally of the secondtubular portion54. Thefirst partitions11 function not only to obstruct undesirable inflow water through theupper opening3 but also to rectify a stream of water entering into the second tubular portion in the vertical direction and thereby to make it difficult for this stream of water to scatter toward the firsttubular portion53.

Thesnorkel51 shown is provided with thefirst partitions11 adapted to obstruct undesirable inflow of water and thesecond partitions12 adapted to improve a purge efficiency achieved by a swimmer's expiration. Therefore, both thefirst partitions11 and thesecond partitions12 are effective to alleviate the swimmer's physical fatigue. It should be understood, however, that the invention may be exploited in the form of the snorkel provided with either the first or second partitions alone.

FIG. 8 shows four embodiments (A)˜(D) of thefirst partitions11 as viewed in the direction as indicated by arrows VIII—VIII in FIG.1. Of FIG. 8, (A) shows an embodiment in which a pair of sets each comprising a plurality offirst partitions11 are opposed to each other in the vertical direction, each set being parallelly arranged side by side in the horizontal direction as viewed in the figure; (B) shows another embodiment in which a plurality offirst partitions11 extend toward a center of theconduit2; (C) shows still another embodiment in which there is provided a single slightly curvedfirst partition11; and (D) shows further another embodiment in which there is provided a singlefirst partition11 extending straightly toward the center of theconduit2.

The snorkel according to the invention can effectively alleviate a swimmer's physical fatigue by the first partitions adapted to obstruct undesirable inflow of water and by the second partitions which improve a purge efficiency achieved by the swimmer's expiration.

Claims (16)

What is claimed is:

1. A diving snorkel comprising:

a snorkel conduit provided with:

an upper opening,

a lower opening,

a mouthpiece, and

a non-return valve adapted to be opened downwards; and

at least one partition provided in a proximity of at least one of said upper opening and said mouthpiece, said at least one partition extending inwardly from an inner wall of said snorkel conduit and also extending longitudinally of said snorkel conduit so that said snorkel conduit is circumferentially compartmented by said at least one partition, and said at least one partition includes two end edges and one side edge all of which are exposed within the snorkel conduit.

2. A diving snorkel according to claim1, wherein said at least one partition is provided in the proximity of said mouthpiece and lies in a region of said inner wall of said snorkel conduit which is opposed to a breathing seat of said mouthpiece.

3. A diving snorkel according to claim1, wherein said at least one partition extends radially inwardly from the inner wall of said snorkel conduit.

4. A diving snorkel according to claim1, wherein said at least one partition comprises a plurality of partitions.

5. A diving snorkel according to claim2, wherein said at least one partition comprises a plurality of partitions.

6. A diving snorkel according to claim3, wherein said at least one partition comprises a plurality of partitions.

7. A diving snorkel according to claim4 wherein said plurality of partitions are parallel to one another.

8. A diving snorkel according to claim5 wherein said plurality of partitions are parallel to one another.

9. A diving snorkel according to claim6 wherein said plurality of partitions are parallel to one another.

10. A diving snorkel according to claim1 wherein at least one partition is provided in proximity of said upper opening and another at least one partition is provided in proximity of said mouthpiece.

11. A diving snorkel according to claim10, wherein said at least one partition and said another at least one partition each comprise a plurality of partitions.

12. A diving snorkel according to claim11, wherein said plurality or partitions in proximity of said upper opening are parallel to one another and the plurality of partitions provided in proximity of said mouthpiece are parallel to one another.

13. A diving snorkel according to claim10, further comprising a second snorkel conduit section coupled to the snorkel conduit adjacent the upper opening thereof, and wherein said at least one partition is provided in said second conduit section.

14. A diving snorkel according to claim13, wherein said at least one partition and said another at least one partition each comprise a plurality of partitions.

15. A diving snorkel according to claim14, wherein said plurality or partitions in proximity of said upper opening are parallel to one another and the plurality of partitions provided in proximity of said mouthpiece are parallel to one another.

16. A diving snorkel according to claim10, wherein said at least one partition is provided in the proximity of said mouthpiece and lies in a region of said inner wall of said snorkel conduit which is opposed to a breathing seat of said mouthpiece.

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